An orthotropus ovule is one in which micropyle and chalaza are

•  in straight line of funiculus

• parallel of funiculus

• at right angles to funiculus

• oblique to funiculus

102.

In a type of apomixis known as adventive embryony, embryos develop directly from the

• nucellus or integuments

• synergids or antipodals in an embryo sac

• accessory embryo sacs in the ovule

• zygote

Through which cell of the embryo sac, does the pollen tube enter the embryo sac?

• Egg cell

• Central cell

• Persistant synergid

• Degenerated synergid

Which one of the following represents an ovule, where the embryo sac becomes horse-shoe shaped and the funiculus and micropyle are close to each other?

• Circinotropous

• Anatropous

• Amphitropous

• Atropous

Double fertilisation was discovered by

• Nawaschin

• Starsburger

• Emerson

• None of the above

Among plants "pheromones" are secreted by the cells of the following plants for given function

• all plants for growth and development

• Yeast for facilitating mating

• all fungi for sexual reproduction

• Rhizopus for formation of zygospore

If the pollen tube enters the ovule through funiculus, the phenomenon is known as

• porogamy

• chalazogamy

• mesogamy

• heterogamy

Which of the following is the most resistant material in pollen grain

• Sporopollenin

• Intine

• Exine

• Certicle

For the formation of tetrasporic embryosac, how many megaspore mother cells are required?

• 1

• 2

• 3

• 4

Double fertilization means

• fusion of nucleus of male gamete with the egg nucleus

• fusion of two polar nuclei

• fusion of sperm nucleus with secondary nucleus

• fusion of one sperm nucleus with nucleus and fusion of other sperm nucleus with secondary nucleus